(19)
(11) EP 2 803 558 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
01.04.2015 Bulletin 2015/14

(43) Date of publication A2:
19.11.2014 Bulletin 2014/47

(21) Application number: 14167653.6

(22) Date of filing: 09.05.2014
(51) International Patent Classification (IPC): 
B62D 6/00(2006.01)
B62D 113/00(2006.01)
 B62D 101/00(2006.01)
B62D 119/00(2006.01)
(84) Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated Extension States:
BA ME

(30) Priority: 15.05.2013 JP 2013103240

(71) Applicant: JTEKT CORPORATION
Osaka-shi Osaka 542-8502 (JP)

(72) Inventors:
  • Tamaizumi, Terutaka
    Osaka-shi,, Osaka 542-8502 (JP)
  • Eki, Hirozumi
    Osaka-shi,, Osaka 542-8502 (JP)
  • Kita, Masayuki
    Osaka-shi,, Osaka 542-8502 (JP)
  • Namikawa, Isao
    Osaka-shi,, Osaka 542-8502 (JP)
  • Hasegawa, Jun
    Osaka-shi,, Osaka 542-8502 (JP)
  • Nishimura, Akihiko
    Osaka-shi,, Osaka 542-8502 (JP)

(74) Representative: Winter, Brandl, Fürniss, Hübner, Röss, Kaiser, Polte - Partnerschaft mbB 
Patent- und Rechtsanwaltskanzlei Bavariaring 10
80336 München
80336 München (DE)

   


(54) Electric power steering system


(57) There is provided an electric power steering system that makes it possible to improve the driver's steering feel, and that includes a controller that controls driving of a motor. The controller computes a first assist component Ta1* based on a steering torque Th. The controller computes a torque command value Th* based on a basic drive torque Tc that is the sum of the steering torque Th and the first assist component Ta1*, and computes an assist compensation component Tac through feedback control based on the torque command value Th*. The controller computes a steered angle command value θt* based on a value obtained by adding the assist compensation component Tac to the basic drive torque Tc, and computes a second assist component Ta2* through feedback control based on the steered angle command value θt*. The controller controls driving of the motor based on an assist command value Tas* that is the sum of the first assist component Ta1 * and the second assist component Ta2*.







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